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[DPRG] help making a dual threaded shaft?

Subject: [DPRG] help making a dual threaded shaft?
From: rten at new.metronet.com rten at new.metronet.com
Date: Tue Sep 9 23:12:01 CDT 2003

Anchor the motor to the right jaw and move the left jar in respect to the
right jaw. Questions?
Ralph

On Tue, 9 Sep 2003, Clay Timmons wrote:

>
> Ralph,
>
> Here is some lovely ASCII art of what I'm building.
>
>
>                Left       |       |    Right
>                 Jaw      ||       ||    Jaw
>                         |||       |||
>                        ||||       ||||
> lead screw >  ----------------------------- + MOTOR
>
>
> For this arrangement you must use a double threaded shaft.
> Otherwise both jaws will move in the same direction.
>
> Do you know another approach that can move the jaws open/closed
> with a simple threaded rod?  (using only one motor)
>
> Thanks,
>
> -Clay-
>
>
> > From: rten at new.metronet.com [mailto:rten at new.metronet.com]
> >
> > Clay:
> > If you rearrange the mechanical setup so that the screw pushes and pulls
> > from one end. Then (for example) clockwise rotation of the screw opens the
> > gripper; CCW closes it. Simpler constuction and software. Think about it.
> > Ralph
> >
>


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